A Verification Method for Correctness of 3D Tolerance Marking
A verification method and correctness technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not specifying the relationship between the number of tolerance types and the corresponding benchmarks, and achieve automatic correctness verification and support tolerance. The effect of inspection and measurement
Active Publication Date: 2016-01-06
HANGZHOU DIANZI UNIV
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[0003] Chinese Patent No. 201010520184.6 (Authorized Notice No. CN101982821B) discloses a complex assembly assembly tolerance specification and its tolerance zone type reasoning method. The patented technical solution proposes to determine the type of tolerance for the geometric elements of the part, but it does not explain the tolerance type and datum The relationship between the number of tolerance types allowed by a geometric element and the relationship between the corresponding datum
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[0061] Example 1 is Figure 4a , 4b and Figure 5a , 5b The model in the example is implemented. Figure 4a , 4b and Figure 5a , 5b The part model is the same, the difference is the geometric tolerance annotation, among which, Figure 4a , 4b dimensioning for the correct geometric tolerance, Figure 5a , 5b The order of fiducials in the geometric tolerance grids of target C and target D was artificially changed in order to check whether the method of the present invention could detect this erroneous modification. It should be noted that the method described in the present invention is a general method and is applicable to other mechanical products and parts.
[0062] image 3 It is the tolerance verification flow chart of the present invention. First, build a three-dimensional solid model in three-dimensional software and perform three-dimensional tolerance annotation on it. Then, by using the method of the present invention for secondary software development, the ...
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The invention discloses a method for verifying three-dimensional tolerance marking correctness. The method includes the steps: (1) building a three-dimensional solid model; (2) marking three-dimensional tolerances; (3) acquiring geometric elements marked with geometric tolerance information in the three-dimensional solid model; (4) building intrinsic directions of target elements; (5) determining natural degrees of freedom of target geometric elements; (6) acquiring the degree of freedom constraint level of datum elements for the target elements; (7) calculating the degree of freedom constraint capacity of a datum system; (8) checking the three-dimensional tolerance marking correctness. The tolerance marking correctness is checked by establishing relationships of various tolerance types and the degrees of freedom according to expression of the degrees of freedom of the geometric elements and a method for calculating the degrees of freedom constrained among the geometric elements, a three-dimensional tolerance domain is further quantitatively described by the aid of the concept of the degrees of freedom, the tolerances are more effectively inspected and measured, and the tolerance marking correctness is automatically verified.
Description
technical field [0001] The invention belongs to the technical field of Computer Aided Tolerance Design (CAT), in particular to a method for verifying the correctness of dimension and geometric tolerance labeling based on the analysis of the degree of freedom of geometric elements and the principle of geometric quantity measurement in a mechanical product design model. Background technique [0002] Tolerance marking is a main form of expression of product geometric accuracy requirements. Compared with traditional two-dimensional drawing methods, three-dimensional tolerance marking can make the model and tolerance requirements more clear and specific, and make the subsequent processing and manufacturing process smoother, thereby improving design and manufacturing. efficiency and reduce product development costs. However, due to the complex types and relationships of tolerance types and geometric elements, the content of tolerance specifications is complex and huge, the correct...
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IPC IPC(8): G06F17/50
Inventor 吴玉光顾齐齐
Owner HANGZHOU DIANZI UNIV